ci: drop support old node

.travis.yml

@@ -1,12 +1,11 @@
 sudo: false
 language: node_js
 node_js:
+  - "12"
   - "11"
   - "10"
   - "9"
   - "8"
-  - "7"
-  - "6"
 
 after_script:
-  - './node_modules/.bin/nyc report --reporter=text-lcov | ./node_modules/.bin/coveralls'
+  - npm run coverage

appveyor.yml

@@ -1,11 +1,10 @@
 environment:
   matrix:
+    - nodejs_version: "12"
     - nodejs_version: "11"
     - nodejs_version: "10"
     - nodejs_version: "9"
     - nodejs_version: "8"
-    - nodejs_version: "7"
-    - nodejs_version: "6"
 
 version: "{build}"
 build: off

package.json

@@ -13,7 +13,7 @@
   },
   "main": "lib/index.js",
   "engines": {
-    "node": ">=6"
+    "node": ">=8"
   },
   "scripts": {
     "version": "conventional-changelog -i changelog.md -s -r 0 && git commit -am \"build: update changelog\"",
@@ -48,13 +48,14 @@
     "@babel/register": "^7.4.4",
     "@commitlint/cli": "^8.0.0",
     "@commitlint/config-angular": "^8.0.0",
+    "acorn": "^6.1.1",
     "ava": "*",
     "babel-eslint": "^10.0.1",
     "babel-plugin-add-module-exports": "^1.0.2",
     "babel-preset-minify": "^0.5.0",
     "clinton": "^0.14.0",
     "conventional-changelog-cli": "^2.0.21",
-    "coveralls": "^3.0.3",
+    "coveralls": "^3.0.4",
     "eslint": "^5.16.0",
     "eslint-config-xo": "^0.26.0",
     "eslint-config-xo-space": "^0.21.0",
@@ -66,7 +67,7 @@
     "eslint-plugin-prettier": "^3.1.0",
     "eslint-plugin-unicorn": "^9.0.0",
     "husky": "^2.4.0",
-    "lint-staged": "^8.1.7",
+    "lint-staged": "^8.2.0",
     "nyc": "^14.1.1",
     "rimraf": "^2.6.3"
   },

readme.md

@@ -16,7 +16,7 @@ Adds the ability to use a custom property in the options, at-rules.
 $ npm install postcss-at-rules-variables
 ```
 
-> **Note:** This project is compatible with node v6+
+> **Note:** This project is compatible with node v8+
 
 ## Usage
 
@@ -38,23 +38,23 @@ var css = fs.readFileSync('css/input.css', 'utf8');
 
 // Process CSS
 var output = postcss()
-    .use(atVariables({ /* atRules: ['media'] */ }))
-    .use(colorFunction())
-    .use(atEach())
-    .use(atImport({
-        plugins: [
-            require('postcss-at-rules-variables')({ /* options */ }),
-            require('postcss-import')
-        ]
-    }))
-    .use(atFor())
-    .use(atIf())
-    .use(cssVariables())
-    .use(nested())
-    .process(css, {
-        from: 'css/input.css'
-    })
-    .css;
+  .use(atVariables({ /* atRules: ['media'] */ }))
+  .use(colorFunction())
+  .use(atEach())
+  .use(atImport({
+    plugins: [
+      require('postcss-at-rules-variables')({ /* options */ }),
+      require('postcss-import')
+    ]
+  }))
+  .use(atFor())
+  .use(atIf())
+  .use(cssVariables())
+  .use(nested())
+  .process(css, {
+    from: 'css/input.css'
+  })
+  .css;
 
 console.log(output);
 ```